From 373bd135079c97c84c83e2199f661b4b4650f8d5 Mon Sep 17 00:00:00 2001
From: zepumph <michael.kauzmann@colorado.edu>
Date: Thu, 3 Oct 2019 15:12:56 -0800
Subject: [PATCH] ObjectIO.supertype === null, factor out getPrototypeOf usages
 to ObjectIO.getSupertype,
 https://github.com/phetsims/phet-io-wrappers/issues/298

---
 js/phet-io/bumper-phet-io-types.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/js/phet-io/bumper-phet-io-types.js b/js/phet-io/bumper-phet-io-types.js
index 7daa6ba..639f8df 100644
--- a/js/phet-io/bumper-phet-io-types.js
+++ b/js/phet-io/bumper-phet-io-types.js
@@ -530,7 +530,7 @@ window.phet.phetio.phetioTypes = assert &&
       "events": [],
       "methodOrder": [],
       "methods": {},
-      "supertype": "Object",
+      "supertype": null,
       "typeName": "ObjectIO"
     },
     "PhetButtonIO": {